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Finding the Fourth Proportional to 80,429.80, 120,659.10 and 33,687.40

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Solution

The fourth proportional to 80,429.80, 120,659.10 and 33,687.40 is: 50,537.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,429.80 : 120,659.10 = 33,687.40 : x
  2. Step 2: Convert to fraction form
    80,429.80/120,659.10 = 33,687.40/x
  3. Step 3: Cross multiply
    80,429.80x = 120,659.10 × 33,687.40
  4. Step 4: Simplify right side
    80,429.80x = 4,064,691,365.34
  5. Step 5: Solve for x
    x = 4,064,691,365.34/80,429.80
  6. Step 6: Final answer
    x = 50,537.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.